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Figure 3.11 The heat rejection process for an integrated CO2 heat pump in domestic hot water mode (70oC) illustrated in a temperature-enthalpy diagram. 100 bar optimum gas cooler pressure. Figure 3.12 The heat rejection process for an integrated CO2 heat pump in Combined mode (35/30oC, 70oC) illustrated in a temperature-enthalpy diagram.85 bar optimum gas cooler pressure. Figure 3.13 shows, as an example, the measured Coefficient of Performance (COP) at optimum gas cooler pressure, 60oC DHW temperature and various supply/return temperatures for the space heating system. The numbers at the bottom of the Combined mode bars display the DHW heating demand ratio (49-57-69%). Figure 3.13 The measured maximum COP at 60oC DHW temperature and various supply/return tempera- tures for the space heating (SH) system for the prototype CO2 heat pump unit (Stene, 2004). The COP in the Combined mode was about 2 to 10% higher than in the DHW mode due to the moderate optimum gas cooler pressure (85-95 bar) and the relatively low CO2 outlet temperature from the tripartite gas cooler (t3) caused by the excellent temperature fit between the supercritical CO2 and the water. International Energy Agency (IEA) Heat Pump Programme – Annex 32 – Workshop in Kyoto, Japan – December 6th, 2007 12PDF Image | INTEGRATED CO2 HEAT PUMP SYSTEMS
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